Quantity in nouns

Below are examples of countable nouns. Pay special attention to the expressions of quantity in parentheses. Those listed below are used only with countable nouns.
Expressions of Quantity Countable Nouns
uno (one) studente (student)
ogni (every) libro (book)
ogni (every) stanza (room)
due (two) piante (plants)
entrambi (both) ragazzi (boys)
un paio di (a pair of) scarpe (shoes)
alcuni (some/few) amici (friends)
molti (many) cani (dogs)
pochi (few) pesci (fish)
parecchi (quite a few/a lot) amici (friends)
meno (fewer) vantagi (advantages)
Below are examples of noncountable nouns. The expressions of quantity preceding parentheses are used only with noncountable nouns.
Expressions of Quantity Noncountable Nouns
un po' di (some/a little bit of) caffè (coffee)
molto (a lot of) ghiaccio (ice)
molta (many) gente (people)
Cardinal adjectives -- one, two, several etc. -- are used with noncountable mass nouns (nouns of substance) only in a very restricted context and mean portion:
Vogliamo due caffè per favore. (We want two coffees, please.)
Il cameriere ci ha portato un tè e un caffè. (The waiter brought us one tea and one coffee.)